/* ========================================
   1. CSS Reset & Custom Properties
   ======================================== */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #0a0a0f;
  --color-bg-elevated: #12121a;
  --color-bg-surface: #1a1a28;

  --color-text: #e8e6e3;
  --color-text-muted: #8a8894;

  --color-accent: #ef4444;
  --color-accent-hover: #f87171;
  --color-accent-glow: rgba(239, 68, 68, 0.15);

  --color-border: rgba(255, 255, 255, 0.06);

  --font-display: 'Raleway', 'Trebuchet MS', sans-serif;
  --font-body: 'Space Grotesk', 'Trebuchet MS', sans-serif;

  --container-max: 1200px;
  --section-padding: 60px 0;
  --radius: 12px;
  --radius-sm: 8px;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (min-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }
}

@media (min-width: 1024px) {
  :root {
    --section-padding: 120px 0;
  }
}

/* ========================================
   2. Base Styles
   ======================================== */

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
}

img {
  max-width: 100%;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ========================================
   3. Utility Classes
   ======================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 32px;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  margin-bottom: 20px;
}

.section-desc {
  color: var(--color-text-muted);
  max-width: 560px;
  font-size: 1.05rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg);
  box-shadow: 0 0 30px var(--color-accent-glow);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========================================
   4. Navigation
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  transition: all var(--transition);
}

@media (min-width: 768px) {
  .nav {
    padding: 20px 40px;
  }
}

.nav.scrolled {
  background: rgba(10, 10, 15, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding-top: 14px;
  padding-bottom: 14px;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

.nav__logo:hover {
  color: var(--color-accent);
}

.nav__logo span {
  color: var(--color-accent);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: center;
}

.nav__toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__links {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 15, 0.98);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  z-index: 999;
}

.nav__links.open {
  display: flex;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
    position: static;
    background: none;
    flex-direction: row;
    gap: 8px;
  }

  .nav__links.open {
    display: flex;
  }
}

.nav__links a {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

@media (min-width: 768px) {
  .nav__links a {
    font-size: 0.9rem;
  }
}

.nav__links a:hover {
  color: var(--color-text);
}

.nav__links a.btn {
  color: var(--color-bg);
  font-size: 0.9rem;
  padding: 10px 24px;
}

/* ========================================
   5. Hero Section
   ======================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(239, 68, 68, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 80%, rgba(239, 68, 68, 0.04) 0%, transparent 40%);
  animation: heroGradient 12s ease-in-out infinite alternate;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

@keyframes heroGradient {
  0% {
    background:
      radial-gradient(ellipse at 20% 50%, rgba(239, 68, 68, 0.08) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 20%, rgba(99, 102, 241, 0.06) 0%, transparent 40%),
      radial-gradient(ellipse at 50% 80%, rgba(239, 68, 68, 0.04) 0%, transparent 40%);
  }
  50% {
    background:
      radial-gradient(ellipse at 40% 30%, rgba(239, 68, 68, 0.1) 0%, transparent 50%),
      radial-gradient(ellipse at 70% 60%, rgba(99, 102, 241, 0.07) 0%, transparent 40%),
      radial-gradient(ellipse at 30% 70%, rgba(239, 68, 68, 0.05) 0%, transparent 40%);
  }
  100% {
    background:
      radial-gradient(ellipse at 60% 40%, rgba(239, 68, 68, 0.08) 0%, transparent 50%),
      radial-gradient(ellipse at 30% 70%, rgba(99, 102, 241, 0.06) 0%, transparent 40%),
      radial-gradient(ellipse at 70% 30%, rgba(239, 68, 68, 0.04) 0%, transparent 40%);
  }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-accent-glow);
  padding: 10px 18px;
  border-radius: 100px;
  margin-bottom: 24px;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero__title span {
  background: linear-gradient(135deg, var(--color-accent), #fb923c);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 540px;
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ========================================
   6. Services Section
   ======================================== */

.services {
  padding: var(--section-padding);
  position: relative;
}

.services__header {
  margin-bottom: 60px;
}

.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (min-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto auto;
  }

  .services__grid .service-card:first-child {
    grid-row: 1 / 3;
  }
}

.service-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: all var(--transition);
  position: relative;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(239, 68, 68, 0.15);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px var(--color-accent-glow);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-glow);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  color: var(--color-accent);
}

.service-card__icon svg {
  width: 24px;
  height: 24px;
}

.service-card__title {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.service-card__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========================================
   7. Portfolio Section
   ======================================== */

.portfolio {
  padding: var(--section-padding);
  position: relative;
}

.portfolio__header {
  margin-bottom: 60px;
}

.portfolio__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .portfolio__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border-color: rgba(239, 68, 68, 0.15);
}

.project-card__visual {
  height: 220px;
  background: linear-gradient(135deg, var(--color-bg-surface), var(--color-bg-elevated));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.project-card__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, var(--color-bg-elevated));
}

.project-card__icon-large {
  font-size: 3rem;
  opacity: 0.6;
  z-index: 1;
}

.project-card__body {
  padding: 28px 28px 32px;
}

.project-card__name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.project-card__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 6px 12px 7px;
  border-radius: 100px;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  border: 1px solid rgba(239, 68, 68, 0.15);
}

/* ========================================
   8. About Section
   ======================================== */

.about {
  padding: var(--section-padding);
  position: relative;
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

@media (min-width: 768px) {
  .about__inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }
}

.about__text .section-desc {
  margin-bottom: 16px;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.stat {
  text-align: center;
}

.stat__number {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat__label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.about__visual {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.about__visual-box {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 1;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--color-bg-elevated), var(--color-bg-surface));
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.about__visual-box::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 200%;
  top: -50%;
  left: -50%;
  background: conic-gradient(from 0deg, transparent, var(--color-accent-glow), transparent, transparent);
  animation: rotateGlow 8s linear infinite;
}

@keyframes rotateGlow {
  100% { transform: rotate(360deg); }
}

.about__visual-box::after {
  content: '';
  position: absolute;
  inset: 2px;
  background: var(--color-bg-elevated);
  border-radius: calc(var(--radius) - 2px);
}

.about__logo-text {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.about__logo-text span {
  color: var(--color-accent);
}

/* ========================================
   9. Tech Stack Marquee
   ======================================== */

.tech {
  padding: var(--section-padding);
  overflow: hidden;
}

.tech__header {
  margin-bottom: 48px;
  text-align: center;
}

.marquee {
  display: flex;
  overflow: hidden;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.marquee:hover .marquee__track {
  animation-play-state: paused;
}

.marquee__track {
  display: flex;
  gap: 48px;
  animation: marquee 30s linear infinite;
  flex-shrink: 0;
  padding-right: 48px;
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-100%); }
}

.marquee__item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color var(--transition);
}

.marquee__item:hover {
  color: var(--color-text);
}

.marquee__item svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* ========================================
   10. Contact Section
   ======================================== */

.contact {
  padding: var(--section-padding);
  position: relative;
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}

@media (min-width: 768px) {
  .contact__inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
  }
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact__item {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.contact__item svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact__cta {
  background: linear-gradient(135deg, var(--color-bg-elevated), var(--color-bg-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px 40px;
  text-align: center;
}

.contact__cta h3 {
  margin-bottom: 16px;
}

.contact__cta p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

/* ========================================
   11. Footer
   ======================================== */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer__logo span {
  color: var(--color-accent);
}

.footer__tagline {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer__nav {
  display: flex;
  gap: 48px;
}

.footer__nav-group h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer__nav-group a {
  display: block;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color var(--transition);
}

.footer__nav-group a:hover {
  color: var(--color-accent);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  margin-top: 40px;
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer__copyright {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer__legal {
  display: flex;
  gap: 24px;
}

.footer__legal a {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ========================================
   12. Subpage Styles
   ======================================== */

.page {
  padding: 140px 0 80px;
  min-height: 100vh;
}

.page__title {
  margin-bottom: 32px;
}

.page__content {
  color: var(--color-text-muted);
  max-width: 720px;
  line-height: 1.9;
}

.page__content h2 {
  font-size: 1.4rem;
  color: var(--color-text);
  margin: 40px 0 16px;
}

.page__content p {
  margin-bottom: 16px;
}

/* ========================================
   13. Animations & Keyframes
   ======================================== */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal[data-delay="1"] { transition-delay: 0.1s; }
.reveal[data-delay="2"] { transition-delay: 0.2s; }
.reveal[data-delay="3"] { transition-delay: 0.3s; }
.reveal[data-delay="4"] { transition-delay: 0.4s; }

/* Hero entrance */
.hero__badge { animation: fadeInUp 0.8s 0.2s both; }
.hero__title { animation: fadeInUp 0.8s 0.4s both; }
.hero__desc  { animation: fadeInUp 0.8s 0.6s both; }
.hero__actions { animation: fadeInUp 0.8s 0.8s both; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========================================
   14. Error Page
   ======================================== */

.error-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
}

.error-page__code {
  font-family: var(--font-display);
  font-size: clamp(5rem, 15vw, 10rem);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-page__message {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}